Poachers are the prey in a park in the Republic of Congo

A group of eco-guards track poachers in a park the size of Connecticut

They uncover a canoe filled with elephant meat, a bloody ax

Some guards are former poachers, who accepted amnesty and turned in weapons

Odzala-Kokoua National Park, Republic of Congo (CNN) -- "The poachers are usually hiding firearms in the fishing camps," Mathieu Eckel briefs us as his anti-poaching unit's shaky metal boats speed down one of the rivers that snakes it way through the Odzala-Kokoua National Park.

The river's dark waters are stunningly framed by shades of green and cascading vines in this remote corner of the Republic of Congo.

As Eckel's eco-guard unit turns a corner, he gives the order to cut the engines. We're approaching the first suspected site. The boats coast silently against the hum of the forest.

The team quietly assaults, but the camp is deserted.

Many of the guards trying to prevent poaching in the Republic of Congo used to be the ones hunting the elephants. The unit's successes haven't made them any friends. Here some of them are pictured on patrol with Odzala-Kokoua National Park's Eco Guards.

The head of the park's anti-poaching unit Mattieu Eckel inspects the trunk of a poached elephant. Eckel describes the fight to protect what's left as guerrilla warfare carried out by just 76 eco-guards patrolling an area that is 13,500 km2 (8,390 square miles) -- about the size of Connecticut.

Eckel describes the fight to protect what's left as guerrilla warfare carried out by just 76 eco-guards patrolling an area that is 13,500 km2 (8,390 square miles) -- about the size of Connecticut. Hardly enough, but around 40% of the team members are former poachers themselves.

Guns, ammunition, bushmeat and other supplies found by Eco Guards at an active poacher's camp.

The unit raids an active poacher's camp, finding evidence of the gruesome practices.

Flying over the Congo basin, world's second largest rainforest system.

Many of the guards trying to prevent poaching in the Republic of Congo used to be the ones hunting the elephants.

Eco Guard Vianney Evoura inspects the poacher's dug out canoe. He used to poach for a trafficking ring leader back in 2004, now he's testified against him in court.

After raiding an active poacher's camp in Odzala National Park, the Eco Guard unit torches the camp to send a message.

Setting fire to a poacher's camp.

The head of the unit, Mathieu Eckel Eckel, tosses the poacher's clothing on the blaze. Forty percent of Eckel's men are former poachers themselves. "They are really motivated to stop the poaching and they know how the poachers work, so it's easy for them to think like them, " Eckel explains.

Odzala National Park has some of the only habituated troops on the planet, allowing researchers to study the critically endangered species, like this baby western lowland gorilla.

The number of Western Lowland Gorillas was unknown until a recent discovery of a population in the northern part of the Republic of Congo. Estimates are that some 125,000 remain in the wild.

Odzala Park's Eco Unit heads back out on the river after torching an active poacher's camp. The team finds four guns, one of which Eckel says is military issue. Of all of the weapons the unit has in its stockpile -- a combination of those handed over in the amnesty program and those seized in raids -- the majority come from military stock.

Eco Guard Brice Moupele is a pigmy and former poacher. He and other pigmies possess unrivaled knowledge of the forest that both poachers and protectors look to exploit.

Pictured here is a stockpile of seized ivory from poachers in Odzala-Kokoua National Park.

The only forest elephant our team came across in our time in Odzala. The non-profit group African Parks -- which runs Odzala -- estimates that Central Africa has lost 62% of its forest elephant population in the last decade.

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in Congo

Chasing elephant poachers in CongoChasing elephant poachers in Congo

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Gallery: Chasing elephant poachers

The challenges of fighting ivory poachers

Ivory demand fuels elephant poaching

A member of the team checks the ashes. "It's still warm, they must have left early morning, we missed them by a couple hours," he says.

For the next grueling, hot eight hours, the same scenario repeats itself.

Then, suddenly around a bend, the unit spots rising smoke. They rush ashore, fan out and within seconds the first gunshot rings out. The men sprint through the dense and disorienting terrain, forcing their way though the undergrowth and knee-deep water as even more bursts of gunfire echo through the forest.

Pumped on adrenaline, eco-guard Brice Moupele animatedly re-enacts what happened when he saw the poachers.

"I yelled 'Stop, stop!' and shot in the air," he says.

"The man tried to shoot at me. I tackled him and grabbed his gun, but he was able to escape." Moupele happily displays the captured weapon.

The team finds the poachers' canoe, weighed down with fresh elephant meat. An eco-guard lifts up a portion of the elephant's trunk, still dripping blood. He lifts up heavy chunks of elephant flesh, searching for weapons and tusk on the bottom of the wooden canoe.

"This is what they use to cut off the tusks" Eckel says, holding up a bloodied ax.

It's a sickening reminder of a trade that has decimated the park's elephant population. The non-profit group African Parks -- which runs Odzala -- estimates that Central Africa has lost 62% of its forest elephant population in the last decade. In the week we spent at the park, we only saw one alive.

"The ivory we get, it's less than 1%" Eckel estimates. "In this area, it makes a lot of money. It's very difficult to say, maybe one or more elephant is killed a day."

Eckel describes the fight to protect what's left as guerrilla warfare carried out by just 76 eco-guards patrolling an area that is 13,500 km2 (8,390 square miles) -- about the size of Connecticut. Hardly enough, but around 40% of the team members are former poachers themselves.

"They are really motivated to stop the poaching and they know how the poachers work, so it's easy for them to think like them," Eckel explains.

It's part of a program developed by Eckel in the past year in which poachers are given amnesty if they hand over their weapons and confess. But it's still a tough sell in an area where villages live off poaching and there are no other alternatives.

Elephants slaughtered from the sky

Rangers dying with elephants in Kenya

The unit's successes haven't made them any friends. Members often find themselves pursuing neighbors, friends and even family members. They have all been threatened.

Frank Bolangonga tells us three men assaulted his wife down a dark side street in his village.

"She went to buy petrol at the market," he says. "When she was on her way back home they attacked her, tried to rape her, but she was strong. She pulled back and her dress ripped and she ran away."

The threats intensify after arrests and raids, and did so even more after the team brought in Ghislain Ngondjo, better known as "Pepito."

Vianney Evoura, who used to poach for Pepito back in 2004, testified against him in court. They live in the same village and Pepito's relatives have vowed revenge.

"His mother promised to poison me," Evoura says. "I don't go out after dark unless I am with five or six other people, I don't eat out. I am always on alert."

African Parks headquarters is just a 10-minute drive from Pepito's village, which has forced Eckel to send his own family away.

"There was threats of attack on the camp where we live, my family was with me at this time. I don't want to take the risk for them because of my job," he tells us.

But the toughest challenge for Eckel and his team is government corruption. He doesn't trust for a second that the government will follow any leads after the bust on the poachers' camp.

The team finds four guns, one of which Eckel says is military issue. Of all of the weapons the unit has in its stockpile -- a combination of those handed over in the amnesty program and those seized in raids -- the majority come from military stock.

"The military sells firearms to the poachers," Eckel claims. "Sometime we catch military with their firearms inside the park."

In an area where the lines between poachers and protectors tend to blur because of village and family ties, at times the team can't even trust itself.

"To find this in the Congo you must have contact with a ranger," Eckel says, showing a compass found at the poachers' camp. "It's a silver one and it's not an old one."

The team torches the camp to send a message and sets off down the river with the poachers' canoe in tow as bright orange flames engulf the ramshackle huts.

But it's far from over.

The next morning, Eckel is busy drawing a map in the sand, strategizing the best way to get into position. One of the numbers on the phone they found is that of a notorious bushmeat trader.

"We had an initial phone contact and we organized a meeting," Eckel explains. "We play like we are the poacher and he thinks we are the poacher."

It's an ambush. Barreling down the road, the team spots the bushmeat trader on his motorcycle. Shouting with guns pointed, they force him to pull over.

"How do you justify that this phone we called you from was found with a poacher?" Eckel asks the trader. "You were saying that you wanted to collect material, ivory."

"I don't know who called me," the trader claims. "Everyone in the village has my number."

The cell phone rings, answered by an eco-guard pretending to be the suspected poacher. The person on the other end of the line issues a breathless warning.

"Remove all the weapons from the camp by the river, we've spotted the eco-guards at the small port."

Meanwhile, the trader breaks, giving up the name and location of the cell phone's owner.

"They are just there, they live there. He's a young guy."

The team detains not one, but two brothers and take them back to one of the unit's checkpoints. One confesses to owning one of the rifles found at the camp, but both deny they shot at the eco-guards and refuse to give up the names of the other members of the gang.